Panasonic TX-23LX60M, TX-23LX60X, TX-23LX60A Service manual

TX-23LX60M

TX-23LX60X TX-23LX60A

LH59 Chassis

ORDER NO. SMT0603005CE

LCD TV

Specifications

Power Source Power Consumption

LCD 58.3cmV

Screen Size 508mm(W) × 286mm(H) Sound

Speaker 12cm × 6cm × 2 pcs,8Ω Audio Output 6W (3W+3W) ,10%THD Headphones M3 (3.5 mm) Jack × 1

Receiving System/Band name

C 110-240 V, 50 / 60 Hz verage use :109W

Standby condition: 0.9W

Wide XGA (1366 × 768 pixels) 16:9 aspect ratio LCD panel.

TX-23LX60M / TX-23LX60X / TX-23LX60A

Receiving Channels Regular TV

Aerial-Rear UHF/ VHF Operating Conditions Temperature : 5°C - 40°C

Connection Terminals

AV1 VIDEO (RCA Pin Type) 1.0 Vp-p (75 Ω)

AV2 VIDEO (RCA Pin Type) 1.0 Vp-p (75 Ω)

HDMI 1/2 TYPE A Connectors Audio Input for HDMI1 RCA PIN Type × 2 0.5 Vrms MONITOR OUT VIDEO (RCA Pin Type) 1.0 Vp-p (75 Ω)

Dimensions ( W × H × D )

Including TV Stand 565mm × 453mm × 260mm

TV Set Only 565mm × 411mm × 119mm

Weight 10.0 kg Net

VHF BAND 2-12 (PAL /SECAM B, K1)

0-12 (PAL B AUST.) 1-9 (PAL B N.Z) 1-12 (PAL/SECAM D) 1-12 (NTSC M Japan) 2-13 (NTSC M U.S.A)

UHF BAND 21-69 (PAL G, H, I/SECAM G, K, K1)

28-69 (PAL AUST.) 13-57 (PAL D, K) 13-62 (NTSC M Japan) 14-69 (NTSC M U.S.A)

CATV S1-S20 (OSCAR)

1-125 (U.S.A CATV) C13-C49 (JAPAN) S21-S41 (HYPER) Z1-Z37 (CHINA) 5A, 9A (AUST.)

Humidity : 5 % - 90 % RH (non-condensing)

S-VIDEO (MINI DIN 4-pin) Y: 1.0 Vp-p (75 Ω ), C: 0.286 Vp-p (75 Ω)

UDIO L-R (RCA Pin Type × 2) 0.5 Vrms

UDIO L-R (RCA Pin Type × 2) 0.5 Vrms Y 1.0 Vp-p (including synchronization) PBCB/PRC

±0.35 Vp-p

UDIO L-R (RCA Pin Type × 2) 0.5 Vrms

Note:

TX-23LX60M / TX-23LX60X / TX-23LX60A

Design and specifications are subject to change without notice. Weight and Dimensions shown are approximate.

CONTENTS

Page Page

1 Safety Precautions 4

1.1. General Guidelines

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices 3 About lead free solder (PbF) 4 Input signal that can be displayed 5 Self-check function

5.1. How to access

5.2. Screen display

6 Chassis Board Layout 7 Disassembly for Service

7.1. Pedestal ass 馳

7.2. Rear cover

7.3. Tuner Cover Ass 馳

7.4. Shield cover

7.5. Power Button Bracket Ass 馳

7.6. Control Panel Ass 馳

7.7. Power Supply unit

7.8. A-Board

7.9. AP-Board

7.10. K-Board

7.11. V-Board and Led Panel

7.12. Speaker

7.13. Main Chassis

7.14. LCD Panel

8 Location of Wiring 9 EMI Processing 10 Service Mode Function

10.1. How to enter SERVICE 1

10.2. How to enter SERVICE 2

10.3. Option Description

10 10 10 10 11 11 11 11 12 12 12 12 13 13

15 16 17

17 17 19

10.4. Option Code Setting

11 Adjustment

11.1. Voltage chart of A-Board

4 5 7 8

8 8

11.2. Voltage chart of AP-Board

11.3. DVCO adjustment

12 Conductor Views

12.1. A-Board

12.2. AP-Board

12.3. K-Board

12.4. V-Board

13 Schem atic Diagram

13.1. Schematic Diagram Notes

13.2. MAIN BLOCK Diagram

13.3. P.C.B. BLOCK Diagram

13.4. SIGNAL BLOCK Diagram

13.5. A-Board (1 of 5) Schematic Diagram

13.6. A-Board (2 of 5) Schematic Diagram

13.7. A-Board (3 of 5) Schematic Diagram

13.8. A-Board (4 of 5) Schematic Diagram

13.9. A-Board (5 of 5) Schematic Diagram

13.10. AP-Board Schematic Diagram

13.11. K and V-Board Schematic Diagram

14 Parts Location & Mechanical Replacement Parts List

14.1. Parts Location

14.2. Packing Exploded Views

15 Mecha nical Replacemen t Parts List 16 Electr ical Replacemen t Parts List

16.1. Replacement Parts List Notes

16.2. Electrical Replacement Parts List

22 22 22

23 29 30 31

33 34 35 36 37 38 39 40 41 42 43

45 46

48 49

TX-23LX60M / TX-23LX60X / TX-23LX60A

1 Safety Precautions

1.1. General Guidelines

1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.

2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed.

3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.

1.1.1. Leakage Current Cold Check

1. Unplug the AC cord and connect a jumper between the two prongs on the plug.

2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis, the reading should be between 1MΩ and 5.2MΩ.

When the exposed metal does not have a return path to the chassis, the reading must be

Figure 1

1.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1 .)

1. Plug the AC cord directly into the AC outlet. Do not use an

isolation transformer for this check.

2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF

capacitors, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1.

3. Use an AC voltmeter, with 1000 ohms/volt or more

sensitivity, to measure the potential across the resistor.

4. Check each exposed metallic part, and measure the

voltage at each point.

5. Reverse the ACpluginthe AC outlet andrepeat each ofthe

above measurements.

6. The potential at any point should not exceed 0.75 volts

RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is outside of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer.

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge (ESD).

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can generate electrical charge sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, alminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

TX-23LX60M / TX-23LX60X / TX-23LX60A

8. Minimize bodily motions when handling unpackaged replacement ES devices.(Otherwise hamless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).

3 About lead free solder (PbF)

Note: Lead is listed as (Pb) in the periodic table of elements. In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder. The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu). That is Tin (Sn), Silver (Ag) and Copper (Cu) although other types are available.

This model uses Pb Free solder in it.s manufacture due to environmental conservation issues. For service and repair work, we’d suggest the use of Pb free solder as well, although Pb solder may be used.

PCBs manufactured using lead free solder will have the PbF within a leaf Symbol

Caution

· Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70°F (30~40°C) higher.

Please use a high temperature soldering iron and set it to 700 ± 20°F (370 ± 10°C).

· free solder will tend to splash when heated too high (about 1100°F or 600°C).

If you must use Pb solder, please completely remove all of the Pb free solder on the pins or solder area before applying Pbsolder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.

· After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto

the opposite side. (see figure below)

stamped on the back of PCB.

Suggested Pb free solder

There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder. However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder can also be used.

TX-23LX60M / TX-23LX60X / TX-23LX60A

4 Input signal that can be displayed

*Mark: Applicable input signal for Component (Y,PB/CB,PR/CR) and HDMI

Signal name Horizontal frequency(kHz) Vertical frequency(Hz) Component HDMI

480i(525)/60Hz 15.73 59.94 * *

480p(525)/60Hz 31.47 59.94 * *

576i(625)/50Hz 15.63 50.00 * * 576p(625)/50Hz 31.25 50.00 * * 720p(750)/60Hz 45.00 60.00 * * 720p(750)/50Hz 37.50 50.00 * *

1080i(1125)/60Hz 33.75 60.00 * * 1080i(1125)/50Hz 28.13 50.00 * *

Note

· Signals other than above may not be displayed properly.

· The above signals are reformatted for optimal viewing on your display.

TX-23LX60M / TX-23LX60X / TX-23LX60A

5 Self-check function

When phenomena like "the power fails from time to time" or "the video/audio fails from time to time" can not be confirmed at the time of servicing, the self-check function can be used to confirm the occurrence and to limit the scope for the defective circuits. Also, when "the power fails from time to time", display on the screen can be used to confirm the occurrence and to limit the scope for the defective circuits.

Any programmed channels, channels caption data and some other user defined settings will be erased and return to factory setting.

5.1. How to access

5.1.1. Access

Produce TV reception screen and, while pressing [VOLUME-] button on the main unit, press [OFF TIMER] button on the remote controller unit simultaneously.

5.1.2. Exit

To exit, turn off the TV.

5.2. Screen display

Display Ref No. Description P.C.B. E2 IC1102 EEPROM A-Board MSP IC2001 TV Sound Power Amplifier A-Board Tun TU101 Tuner A-Board FPGA IC4004 LCD Driver and Display Control A-Board HDMI IC5004 HDMI Processor A-Board CEC IC5001/IC5002 CEC Control A-Board

6 Chassis Board Layout

TX-23LX60M / TX-23LX60X / TX-23LX60A

Board Name Function

A-Board Main (AV connector, AV Switch, Tuner, Audio & Video Processor,

V-Board Remote Receiver, LED, B.A.T.S. K-Board Headphone jack AP-Board Power Supply, Power Regulator Power Unit Power (AC/DC)

Control Panel Unit None serviceable.

MCU, LCD Driver, LVDS)

None serviceable. Power Unit should be exchanged for service.

Control Panel Unit should be exchanged for service.

TX-23LX60M / TX-23LX60X / TX-23LX60A

7 Disassembly for Service

7.1. Pedestal ass’y

1. Lay down the main unit so thatthe rear coverfaces upward.

2. Remove the fixing screw (2 pcs).

3. Remove the hinge cover.

4. Remove the fixing screws (4 pcs).

5. Remove the pedestal ass’y.

3. Remove the fixing screws (2 pcs).

4. Remove the Tuner Cover Ass’y.

7.2. Rear cover

1. Remove the fixing screws (9 pcs and 3 pcs).

2. Remove the rear cover.

7.4. Shield cover

1. Remove the AC cord and Tuner Cover. (See 7.3)

2. Remove the fixing screws (5 pcs

3. Remove the Shield cover.

7.3. Tuner Cover Ass’y

1. Remove the Rear Cover. (See 7.2)

2. Take out the groove of the AC cord from the slot of the Tuner cover Ass’y.

7.5. Power Button Bracket Ass’y

1. Remove the rear cover. (See 7.2)

2. Remove the fixing screws (2 pcs).

3. Remove the Power Button Bracket Ass’y.

TX-23LX60M / TX-23LX60X / TX-23LX60A

7.6. Control Panel Ass’y

1. Remove Power Button Bracket Ass’y. (See 7.5)

2. Remove the fixing screws (2 pcs).

3. Disconnect the coupler (AP6).

4. Remove Control Panel Ass’y.

7.7. Power Supply unit

1. Disconnect the coupler (AP1~CN301).

2. Remove the fixing screws (4 pcs).

3. Remove the Power Supply unit.

7.8. A-Board

1. Disconnect the couplers (A1~AP3, A2~AP4, A3, A4, A7, LVDS).

2. Remove the fixing screw (10pcs).

3. Remove A-Board.

TX-23LX60M / TX-23LX60X / TX-23LX60A

7.10. K-Board

4. Fix the Rubber to IC4001 and the Shield case (top) to ABoard.

Caution:

a. Fix carefully Shield case to shield clip (9 pcs). b. Confirm a hole of shield case to fit with rubber.

1. Remove K-Board.

2. Disconnect the coupler (K1~A4).

7.11. V-Board and Led Panel

1. Remove the fixing screws (2 pcs).

2. Disconnect the coupler (V1~A7).

3. Remove V-Board.

7.9. AP-Board

1. Disconnect the couplers (AP3~A1, AP4~A2, AP1~CN301, AP5, AP6).

2. Remove the fixing screw (3pcs).

3. Remove AP-Board.

7.12. Speaker

1. Remove the fixing screws (8pcs).

2. Remove Speakers (left and right).

TX-23LX60M / TX-23LX60X / TX-23LX60A

7.13. Main Chassis

1. Remove the fixing screws (8 pcs) and Cabinet fixing MTG (2 pcs).

2. Disconnect the couplers (AP5, A3, A4, A7, LVDS coupler).

3. Remove the Main Chassis.

7.14. LCD Panel

1. Remove the fixing screw (1 pcs) and the LCD fixing MTG (bottom).

2. Remove the fixing screws (6 pcs) and the LCD fixing MTG (R and L).

3. Remove LCD Panel.

TX-23LX60M / TX-23LX60X / TX-23LX60A

8 Location of Wiring

TX-23LX60M / TX-23LX60X / TX-23LX60A

9 EMI Processing

TX-23LX60M / TX-23LX60X / TX-23LX60A

10 Service Mode Function

MPU controls the functions switching for each IC through IIC bus in this chassis. The following setting and adjustment can be adjusted by remote control in Service Mode.

10.1. How to enter SERVICE 1

1. Set OFF TIMER to 15,30.....

2. Set VOLUME to MINIMUM. Press the F button on the TV set to select VOLUME, simultaneously press RECALL button on remote control and DOWN button [-/v ] on the TV set.

10.2. How to enter SERVICE 2

1. Select the “Sub-Brightness” under Service 1.

2. Simultaneously press MUTE button on remote control and DOWN button on the TV set.

Note:

To exit to Service mode, press N button or POWER button on remote control.

TX-23LX60M / TX-23LX60X / TX-23LX60A

+ 40 hidden pages